JPH0624830Y2 - Document transport sheet for image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Purpose of the Invention (Field of Industrial Application) The present invention relates to a document carrying sheet in an image forming apparatus such as a copying machine.

(Problems to be Solved by Prior Art) In a copying machine of a type that moves an original, when the original is conveyed, the original is sandwiched between two sheets which also protect the original and is inserted into the main body of the copying machine. What is composed is already known.

In such a configuration, since the original conveying sheet has to have a certain thickness, the impact of the leading and trailing edges of the sheet when entering and discharging the pair of conveying rollers in the copying machine main body As a result, the smooth progress of the sheet, and hence the original document held on the sheet, may be hindered, resulting in defective images.

The present invention has been made to cope with such a situation, and enables a smooth conveyance of a document conveyance sheet without the need for a special accessory structure on the copying machine main body side, so that a high quality image can be obtained. It is an object of the present invention to provide such a document conveying sheet.

(2) Configuration of the Invention (Technical Means for Solving the Problem and Its Action) In order to achieve the above-mentioned object, the present invention provides a document transporting sheet that clamps a document and transports it to an exposure unit in the main body of the image forming apparatus. At least one of the edges in the traveling direction of the transport sheet is formed non-parallel to the axis of the transport roller in the image forming apparatus.

With such a configuration, it is possible to effectively prevent the deterioration of the image quality such as image blurring by mitigating the impact at the time of entering and ejecting the edge of the document transport sheet, particularly when the document transport sheet is transported. be able to.

(Description of Embodiments) FIG. 1 is a plan view of an original conveying sheet according to the present invention. The sheet is composed of a sheet member 1 and a sheet member 2 superposed on the sheet member 1, and both of them are integrally copied. The document 3 is inserted into the main body of the machine, and the document 3 is sandwiched between the two.

The conveying sheet is moved in the left-right direction in the drawing to be inserted into and discharged from the main body of the copying machine. For this reason, tapered portions 4a, 4b and 5a, 5b are formed on the left and right edges of the sheet, respectively. Further, as shown in the drawing, the length of the sheet member 2 is smaller than the length of the sheet member 1 when viewed in the sheet moving direction.

FIG. 2 is a perspective view showing the conveying portion of the above-mentioned original conveying sheet in the main body of the copying machine.
In the copying machine so that a and 4b are the leading edges, they travel in the direction of the white arrow α, are transported by the transport roller pairs 6, 8 and 7, 9 and pass through the exposure glass 14, and then the transport roller pair 10, It shall be discharged in the β direction by 12 and 11, 13.

In this case, the length of each of the rollers is smaller than the length of the above-mentioned tapered portion as viewed in the direction orthogonal to the sheet traveling direction, and the distance between the roller pairs 6, 8 and 7, 9 and the roller pair 10, It is preferable that the distance between 11 and 13 is the same as that of 12 so that each roller is located in the area where the taper portion of the sheet is present (the above-mentioned taper portion has a relative position). The length is not limited to this).

With this configuration, as shown in FIG. 3, when the sheet member 1 and the sheet member 2 that are superposed are advanced in the direction of the arrow α and reach the position (1), the taper portion 4 is formed.
Since the sheet member 1 is gradually sandwiched by the rollers 6 and 7 due to the presence of the a and 4b, the impact is alleviated and the sheet proceeds smoothly.

Further, since the sheet member 2 is pinched by the roller pair after the sheet member 1 is bitten, and the sheet member 2 is pinched by the roller pair of the conveyed sheet, the shock at the time of entry is overall. Get smaller.

When the conveyed sheet is ejected from the roller pair 10, 12, etc., it is ejected in a state in which the shock is alleviated due to the presence of the taper portions 5a, 5b as described above.

FIG. 4 shows another embodiment, which has a configuration in which the edges of the respective roller pairs that enter and discharge are cut obliquely, and with such a configuration, the conveyance of the conveyance sheet can be carried out more smoothly. You can

FIGS. 5A to 5C show another embodiment showing the leading edge (similarly to the trailing edge) of the sheet member. In FIG. 5A, the taper portion is directed in the opposite direction to that of the above embodiment. It has an inclined structure.

In FIG. 5B, instead of the linear taper portion, a portion corresponding to the roller on the main body side is formed smoothly.

Further, in the case of FIG. 5C, the edge of the sheet member as a whole is formed into two taper portions which are inclined in mutually opposite directions.

In view of the fact that the portions sandwiched by the pair of rollers on the main body side are formed in a tapered shape in the above-described FIGS. 1 to 3, all of the embodiments described above It can be easily understood that the same effect can be achieved.

(3) Effect of the Invention As described above, according to the present invention, in the original conveying sheet configured to sandwich the original between the two sheet members and convey it to the exposure section of the copying machine, the original conveying sheet Since it is possible to reduce the shock at the time of entry into the copying machine and the discharge at the time of discharging, and to make the exposure of the original document smooth, it greatly contributes to obtaining a good quality image.

[Brief description of drawings]

FIG. 1 is a plan view of an original conveying sheet according to the present invention, FIG. 2 is a perspective view of a main portion showing the sheet being conveyed to the copying machine main body, and FIG. FIG. 4 is a side view showing another embodiment of the edge of the same sheet, and FIGS. 5A to 5C are plan views of relevant parts showing another configuration of the edge of the same sheet. 1, 2 ... Sheet member, 3 ... Original, 6 to 13 ...
Rollers 4a, 4b, 5a, 5b ... Tapered edges of the conveying sheet.

Claims (2)

[Scope of utility model registration request] 1. A document transporting sheet for sandwiching a document and transporting it to an exposure unit in an image forming apparatus main body, wherein at least one edge of the transporting sheet in a traveling direction is a transport roller in the image forming apparatus. A document transport sheet formed non-parallel to the axis. 2. The document transport sheet according to claim 1, wherein at least one of the edges of the document transport sheet in the traveling direction is formed so that the thickness becomes thinner toward the tip.